Smelling Catmull-Rom36 or Bicubicresize36
Code:
From madshi:Great! yesgrey3 earlier reported that "Akima" splines may be interesting.
I haven't been able to turn that documentation into a
coefficient set that I could use for my resampling filters...
http://www.fugroairborne.com/resourc...ension_III.pdf
on page 4: equations 2 to 5 .
This will allow you to only interpolate between points 2 and 3.
Another one is the constrained spline (with different derivatives at endpoints) described in
http://www.korf.co.uk/spline.pdf (interesting because no need to solve a system of equations)
Other ideas (preserving convexity over C1 continuity , locally monotonous constraint...) in
http://math.lanl.gov/~mac/papers/numerics/H83.pdf